Who is actually responsible for creating the logic interlock diagrams in new projects these days?
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Who usually actually creates the logic interlock diagrams in new projects these days? Is it an instrumentation design engineer from an engineering firm in a design institute, or a system manufacturer? Is it the case that sometimes the drawings are prepared by the design institute, but in reality the content is entirely created by the system manufacturer?
The interlock logic diagram is prepared by the design institute, and then the system manufacturer programs and configures it based on that diagram. Even the most skillful cook can’t prepare a meal without rice; the “rice” for system manufacturers is provided by the design institutes.
For the projects we undertake, it is the owner’s engineer who creates the logic diagrams, or they guide the engineers at the design institute/engineering company to prepare the drawings； If it’s produced by a design institute, it depends on the situation; in practice, it turns out that the quality of such drawings produced by quite a number of design institutes is poor
Interlocks should be determined through HAZOP at the early stage of the project, after which the design company carries out the design in accordance with the specified requirements; the actual functionality is implemented by a programming company
Hey sea friend, you make HAZOP sound too amazing. HAZOP is an analysis tool; when is it used?
Who creates the interlock logic diagram? As for the scoring criteria: if a project uses a process package provided by a research institute or another organization, such a package usually includes an interlock logic diagram. In this case, the design agency or engineering company is responsible for reviewing and optimizing the interlock logic diagram contained in the process package, and HAZOP is utilized for this purpose in order to optimize the interlock logic diagram. If the project uses a process developed by the engineering company or design institute itself, then the engineering company or design institute is responsible for creating the interlock logic diagrams, usually carried out by the professionals in the process systems field and the instrumentation field. Of course, the interlock logic diagrams for small projects or small sets of equipment are also provided by the supplier. Please feel free to correct me!
The sequential logic diagrams are usually prepared by the design institute, but during actual configuration, the system manufacturers refer to these diagrams and configure the systems according to the actual conditions. Anyway, that’s how the projects in our company are handled
Thank you for the answer. In the second scenario you mentioned, where the design institute’s engineering company creates the chain diagrams on its own, I would like to ask whether in this case the engineering company carries out the work entirely independently, or does it need technical support from the system manufacturer? If the interlock diagram is quite complex, with many functions such as RS flip-flops and various timing modules, it seems that system manufacturers are better suited to carry out this task. I believe this is a highly specialized task, and since there are no standard guidelines, one can only rely on experience. Converting textual descriptions of interlock functions into actual interlock diagrams is clearly something for which system manufacturers have more experience. Also, if I make the interlock diagram incorrectly, will the system manufacturer modify it themselves?
The interlock logic diagram is provided by the design institute, and the system manufacturer programs and configures the system based on those diagrams; they don’t understand the process aspects